Kpler counted five commodity vessels through the Strait of Hormuz on 16 August, a complete trading day, against 31 across the previous weekend, in data cited by a Reuters wire datelined Singapore1. The two figures do not cover the same span: one is a single day, the other a weekend, and the underlying collapse is steep enough that the shape holds either way. Weekend transits through the Bab el-Mandeb fell to 49 from 55. Before the war the strait carried more than 130 ships a day. A week ago the trackers were still arguing about which shore the remaining traffic had moved towards. That argument is smaller now, because there is far less left to count.
Windward, a maritime intelligence firm that monitors transponder activity, recorded four outbound vessels going dark on 14 August2. Going dark means switching off the Automatic Identification System (AIS), the transponder merchant ships are required to broadcast so that other traffic and coastal authorities can see them. The stretches ran from 11 hours to roughly a month. One vessel resurfaced outbound with an estimated 2 million barrels of Saudi crude aboard after about a month unseen, and Bloomberg reported the same day that supertankers are staying dark for longer to move oil out of the region3.
Those two findings sit awkwardly together. A tracker cannot count a ship that is not transmitting, so Kpler's five is a floor on real movement rather than a measurement of it, and nobody can say how far above that floor the true number sits. The gap matters for the war rather than for freight rates, which belong to another desk: a chokepoint whose traffic is unmeasurable is one where neither Washington nor Tehran can prove what the blockade is actually doing, and both are free to claim it.
